Paint



mes Nov. 24, 1931 i a UmTEu STA Harms BERNARD, 01' UEBDINGEN, G

L'KTIENGESELLSCEAIT, OI FRANIIOBI-O O1 GERMANY a In Drawing. Application fled August a7, 192a,:seun-mwacamsfiaiiaivwciusa sei The invention relates to improvements coating compositions and more particularly to paints com risinga white. gment and yie ding smoot coatmgs of hi gloss.

A paint which is compose in the usual manner of a drying oil, with or without the addition of a thinner, and a white pigment, for example zinc oxide, has the tendency to dry to a dull film without gloss when the 10 quantity of the covering pigment exceeds a certain upper limit. Besides these aints applied to a smooth surface do not yield a a smooth coating of uniform appearance but on dryin show the strokes of brushing.

I have iound that aint vehicles whic may be incorporated wit considerable amounts of a white pigment to form paints which dry to a glossy and smooth surface can be obtained by adding to the raw materials commonly used, unsaturated aliphatic carboxylic acids 1 having less than 12 carbon'atoms. In carrging out In invention I incorporate with t drying oi such as linseed oil and its trans-' formation products, China wood oil or the gin which small quantities of resins such as co ophony or resin esters may be also present in the dissolved state) an unsaturated aliphatic carbo lic acid of the aforesaid kind which pro erably may have a double '3 linkage in the aor fi-position for example acrylic acid and its polymerization, roducts, furfuryl acrylic acid, crotonic aci ,hydrosorbic acid, angelic acid, sorbic acid or the like. A small addition-up-to 5 percent-of these compounds is sufiicient to produce paint vehicles which are excellently suitable .ior brushing and yielding coatings of high gloss even with large quantities of covering pigments.

4c The amount of pigments used, which need not be white pigments, may be considerably higher than customarily in the manufacture oi paints without injuring the properties of the coating composition. i a i as My invention is illustrated by the following "customs ism 3 N-THB-HAIN GERMANY parts are by weight.

, sam ler 1000 parts of stand "oil (iodine number 127; viscosity [at 100 o. 15.5 lfleil 7 are heated at 110 to 120 and mix wit examples -vybutggnot j restricted The 3o parts of-crotonic acid which is readily dissolved by slight stirring. .After cooling down-500 parts of zinc oxlde are groundin 330 parts of the mixture inlthe customai manner to form a paste and mixed wit 110 parts of a thinner (for examples. mix ture of 1 part turpentine and 9 arts of white spirit). By adding the usua amount of a drier, say, 2 parts of cobalt resina'te, v

dissolved in 8 parts of white spirit, a white paint is obtained drying to a smooth coatmg of high gloss.

' Example 2 (iodine number down 500 parts of zinc oxide arid p a paste, mixed with 110 parts of a thinner l (for example'a mixture of 3 parts of tur-. pentine and 7 parts of white spirit) and the usual amount of a drier. The paint thus prepared yields a smooth and glossy fihn.

, I claim:

1. A drying oil ing an unsaturate having less than 12 ca a double linkage in the alhpa-position.

2. A drying oil paint composition containing crotonic acid.

paint composition contain 3. A composition of matter comprising drying oil, a thinner, a drier, a pigment and an unsaturated aliphatic carboxylic acid having less than 12 carbon atoms and having a double linkage in the alpha-position.

4. A composition of matter comprising a alipjhatic carboxylic acid. r on atoms and having drying oil, a thinner, a drier, a white pigment and an unsaturated aliphatic carboxyhc acid havin less than 12 carbon atoms and 7 having a ouble linkage in the alpha-position. m 5. A composition of matter comprising a drying oil," a thinner, a drier, zinc oxide and an unsaturated aliphatic carboxylic acid having lessthan 12 carbon atoms and having a a double linkage in the'alpha-position. j 1. 6. A composition of matter comprisin stand oil, a thinner, a. drier, zinc oxide an crotonic acid.

7. A drying oil paint composition containing sorbic acid.

- u 8. A composition of matter compriam'g stand oil, a thinner, a drier, zinc oxide and sorbic acid. a

In testimony whereof I have hereunto set my hand. Y HANNS BERNARD. 

